Having transparent faces helps a lot when working with large assemblies with a lot of inner components. When you click on a transparent face, SOLIDWORKS selects the visible opaque component behind it. Although it is a nice feature that can be helpful in many cases but in some other cases it can be a pain especially when you need to select the transparent body. The good news is that there are ways to bypass this default behavior of SOLIDWORKS when you deactivate the selection through transparency option.
If you need to select a transparent face for a few times you can simply use the shift key.
But if you need to completely change SOLIDWORKS behavior and want the ability to select all the transparent faces like an opaque one then you can go to Tools > Options > System Options > Selection and uncheck “Enable selection through transparency” checkbox.
Now when you click on any transparent face, SOLIDWORKS will select that face instead of behind components.